Linear elastic fracture mechanics approach to edge debonding in plated beams

In this paper a simple linear elastic fracture mechanics approach is proposed for prediction of edge debonding in plated beams. The analytical model results in simple equations, suitable for immediate design use. The load–deflection curve of a plated beam, from the onset of debonding up to the complete separation of the plate, is obtained by controlling the length of the interfacial debonding crack. Its shape clearly shows that snap-back or snap-through instabilities may arise when the beam is loaded under displacement or force control. Analytical predictions are also compared with finite element results based on an interfacial cohesive crack model. It is shown that predictions of the proposed analytical model match very closely the numerical solution, provided that an effective crack length accounting for the size of the fracture process zone is used in the calculations.